<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>!bootstrap</title>
	</head>
	<body>
		<h1>!bootstrap标题1</h1>
		<h2>!bootstrap标题2</h2>
		<h3>!bootstrap标题3</h3>
		<h4>!bootstrap标题4</h4>
		<br /><br /><br />
		<div class="h1">!bootstrap标题1</div>
		<div class="h2">!bootstrap标题2</div>
		<div class="h3">!bootstrap标题3</div>
		<div class="h4">!bootstrap标题4</div>
	</body>
</html>